<?php
session_start();
if (!isset($_SESSION["username"])) {
    header("Location: login.php");
    exit();
}
?>
<html>
<head>
    <title>图书管理后台管理中心</title>
    <meta charset="utf-8">
    <style type="text/css">
        body {
            margin: 0;
            padding: 0;
            background-color: #f5f5f5;
        }
    </style>
</head>
<body class="body">
    <div style="margin-top: 0px;">
        <?php include_once("book_top.php");?>
    </div>
    <div style="margin-top: 5px;">
        <?php include_once("book_center.php");?>
    </div>
</body>
</html>